Double tilde (~~ or ≈) may refer to:
Approximation Double negation Smart match operator in Perl, In PostgreSQL the operator is equivalent to In certain programming languages, ~ transforms a value into an integer and takes its complement, and so ~~ (sometimes called 'two tildes' to indicate a form of double negation) is a way to transform a value into an integer. , a tilde diacritic that spans a pair of adjacent characters:
See also ~~~, an EP by Ana Roxanne